It was announced last week that he is expecting his first child with girlfriend Viviane Thibes.

And Cameron Douglas, who is the son of Hollywood star Michael Douglas, 72, was adamant on staying in shape for his future fatherly duties as he embarked on a gruelling run along Manhattan's Hudson River Park on Sunday.

The American actor, 38 - who was released from prison one year ago, after serving seven years for drug possession - displayed his impressively chiselled inked torso in a pair of tiny shorts as he honed his physique.

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Hottie: Cameron Douglas, 38, was adamant on staying in shape for his future fatherly duties as he embarked on a gruelling run along Manhattan's Hudson River Park on Sunday

Road to success: Cameron, who bares an uncanny resemblance to his Hollywood star Michael Douglas (R-pictured in 1994's flick Disclosure), is keen on turning his life around following a tough few years behind bars

Cameron looked incredible as he displayed his sensational form which proved to be heavily inked as he headed for the run.

The celebrity offspring flaunted his gym-honed torso in a pair of light blue shorts and paired it with trendy trainers which provided enough comfort for him to sprint down the streets.

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Wanting to be totally in the zone, Cameron opted in favour of some high energy music as he was seen sporting headphones.

Taking no risks for a potential injury, he ensured to properly stretch before he headed off for a run in the sunny weather.

Gym-honed: The American actor - who was released from prison one year ago, after serving seven years for drug possession - displayed his impressively chiselled inked torso in a pair of tiny shorts as he honed his physique

Dad to be: It was announced last week that the son of Hollywood star Michael Douglas, 72, is expecting his first child with girlfriend Viviane Thibes

Expanding their family: It was announced last week that Cameron is expecting his first child with stunning Brazilian girlfriend Viviane Thibes

Romance: Thibes was first seen with Cameron just after he was released from prison in August 2016 (Pictured leaving NYC court together in June)

His sweat session comes after the news that he is set to be a first time dad with his girlfriend. This will be his dad Michael's first grandchild.

Regarding the pregnancy, a source told People: 'Everyone is thrilled for him. Michael is looking forward to being a grandfather.'

The Wall Street actor, 72, also has son Dylan, 17, and daughter Carys, 14, with Oscar-winning actress Catherine Zeta-Jones, 47, his wife of 17 years.

The exciting news for Cameron comes one year after Cameron was released from prison after serving seven years for drug possession.

He received a five-year sentence for possession of heroin and selling methamphetamine. His sentence was extended when he admitted to smuggling drugs into prison.

Call me grandpa: Cameron's baby with Thibes will be Michael's first grandchild. The father and son duo are pictured above together in 2009

Edgy star: Cameron looked incredible as he displayed his sensational form which proved to be heavily inked as he headed for the run

Sporty: The celebrity offspring flaunted his gym-honed torso in a pair of light blue shorts and paired it with trendy trainers which provided enough comfort for him to sprint down the streets

The star - who appeared in 2003's It Runs In The Family with his dad Michael as well as grandfather Kirk Douglas, 100 - has been sober ever since.

Thibes was first seen with Cameron just after he was released from prison in August 2016.

'I have a beautiful and loving family who has faithfully supported me every step of the way, believing in me and refusing to give up in the face of one bleak adversity after the next.'

Buzz: Wanting to be totally in the zone, Cameron opted in favour of some high energy music as he was seen sporting headphones

Fitness enthusiast: Taking no risks for a potential injury, he ensured to properly stretch before he headed off for a run in the sunny weather

Parenthood: His sweat session comes after the news that he is set to be a first time dad with his girlfriend

He added: 'I feel in the deepest recesses of my heart that there is a beautiful purpose hidden along this painful journey.'

In 2013 Michael - who is best known for TV's The Streets Of San Francisco and the movie Basic Instinct - told Vanity Fair he was 'very disappointed in the system' when his son was not released from prison.

'My son is in federal prison,' he told reporters. 'He’s been a drug addict for a large part of his life.

'Part of the punishments—if you happen to have a slip, and this is for a prisoner who is non-violent, as about a half-million of our drug-addicted prisoners are—he’s spent almost two years in solitary confinement.

Troubles: The exciting news for Cameron comes one year after Cameron was released from prison after serving seven years for drug possession

Past: He received a five-year sentence for possession of heroin and selling methamphetamine. His sentence was extended when he admitted to smuggling drugs into prison

'Right now I’ve been told that I can’t see him for two years. It’s been over a year now. And I’m questioning the system.'

He went on: 'Obviously at first, I was certainly disappointed in my son. But I’ve reached a point now where I’m very disappointed with the system.

'And as you can see from what Attorney General Eric Holder has been doing regarding our prison system, I think things are going to be revived, regarding nonviolent drug addicts.

'My last comment on that is the United States represents 5 percent of the world’s population and we have 25 percent of the world’s prisoners.'

'You inspire me everyday': Viviane has shared a few photos to her Instagram page with Cameron where she's expressed her love for him